A bit off our irregular posts..... I have a question for you blogger whizzes?

My question is this how do you make those cute multi -facet pictures and use it as a HTML button to advertise/ invite people to your blog?  I spent two hours online last night trying to figure it out and still don't know. I am a self taught computer person, so my technical language is slim.  Thanks for any and all help, I'd just like a cute button/ picture to send to people who ask for the link to our blog.  Isn't it wonderful that I can say I'm still learning*wink* and not be ashamed to admit it, LOL!!!!